Use of perfluoroalkanesulphonic acid amides and/or cyclimmonium salts of perfluoroalkansulphonic acids as mold release agents

ABSTRACT

The present invention is concerned with molding compositions which contain an aromatic polycarbonate and from about 0.001 to 1% by weight of a mold release agent selected from the group consisting of perfluoroalkanesulphonic acid amides and cyclimmonium salts of perfluoroalkanesulphonic acids.

BACKGROUND OF THE INVENTION

Aromatic polycarbonates are employed in numerous technical fields ofapplication because of their typical tough and elastic properties. Adisadvantage is their poor mold release when injection-molded whichfrequently results in relatively long cycle times. However, for economicand technical reasons it is desirable to shorten the cycle times as faras possible so as to manufacture larger numbers of moldings per unittime on the injection molding machines. This can be achieved, forexample, by injection molding at higher temperatures. However, for thispurpose the polycarbonate melt must be so modified that the release ofthe molding from the mold wall takes place with low release forces andat high temperatures without sticking of the solidified melt to the moldwall. Easy mold release at high temperatures is in particular alsodesired in the case of complicated moldings which are produced in moldswith parts which cannot be cooled (for example cross-webs, cores and thelike).

In the past, long-chain aliphatic carboxylic acid esters of monohydricand trihydric alcohols have been added to improve the mold release ofaromatic polycarbonates in accordance with DOS (German PublishedSpecification) NO. 2,064,095, DOS (German Published Specification) No.2,220,185, U.S. Pat. No. 3,784,595 and U.S. Pat. No. 3,836,499. However,a disadvantage of these mold release agents is the deterioration of themechanical properties of the aromatic polycarbonates on prolonged heatexposure as a result of which the aromatic polycarbonates which havebeen modified according to DOS (German Published Specification) No.2,064,095 and DOS (German Published Specification) No. 2,220,185, U.S.Pat. Nos. 3,784,595 and 3,836,499 in order to give easy mold release nolonger satisfy certain technical requirements.

U.S. Pat. No. 3,775,367 discloses the use of specificperfluoroalkanesulphonic acid derivatives as additives to polycarbonatesto improve the flame resistance of polycarbonates, but makes no mentionof the mold release properties of the additives.

SUMMARY OF THE INVENTION

It is now the object of the present invention to provide a mold releaseagent for aromatic polycarbonates which imparts to the polycarbonates,which are to be released from the mold, release properties which areadequate for all industrial applications, while on the other hand therelease agent leaves the level of mechanical properties of the purearomatic polycarbonates essentially unaffected even after prolonged heatexposure. In view of the advantages described above, a mold releaseagent for higher mold release temperatures is particularly desirable.

Accordingly, the subject of the present invention is the use ofperfluoroalkanesulphonic acid amides and/or cyclimmonium salts ofperfluoroalkanesulphonic acids as mold release agents for thermoplastic,high molecular weight, aromatic polycarbonates.

DETAILED DESCRIPTION OF THE INVENTION

High molecular, thermoplastic, aromatic polycarbonates are in particularthose based on dihydroxydiaryl compounds of the formula I ##STR1##wherein

R are identical or different and are H, C₁ -C₄ alkyl, Cl or Br and

X¹ is C₁ -C₈ alkylene, C₂ -C₈ alkylidene, C₅ -C₁₅ cycloalkylene and C₅-C₁₅ cycloalkylidene.

Perfluoroalkanesulphonic acid amides are in particular those of theformula IIa

    R.sub.F - SO.sub.2 - X TM IIa

wherein

R_(F) is a linear or branched aliphatic perfluoroalkyl radical with 1 to12 C atoms or a cyclic aliphatic perfluoroalkyl radical with 3-12 Catoms and

X is NR¹ R²,

wherein

R¹ and R² are identical or different and can be hydrogen, C₁ -C₁₈ alkyl,C₇ -C₂₀ aralkyl and C₅ -C₂₀ cycloalkyl, and furthermore R¹ and R² canform a heterocyclic structure with the N atom.

Cyclimmonium salts of perfluoroalkanesulphonic acids are especiallythose of the formula IIc

    R.sub.F - SO.sub.2 - X                                     IIc

wherein

R_(F) has the meaning indicated for IIa and

X is ##STR2## wherein

R¹ can be C₁ -C₁₈ alkyl, C₇ -C₂₀ aralkyl or C₅ -C₂₀ cycloalkyl and##STR3## is an aromatic heterocyclic compound containing

1 hetero nitrogen atom, such as ##STR4##

The mold release agents according to the invention are employed inamounts of about 0.001 to 1% by weight, preferably about 0.001 to 0.01%by weight, relative to the weight of polycarbonate.

According to the present invention, the following advantages areachieved:

The mechanical properties of the polycarbonates and their molecularweight are uninfluenced by the added mold release agent. Even afterheating for 300 hours at 130° C, no molecular weight degradation and nodeterioration in the mechanical properties is observed. This isspecifically of particular advantage in relation to multiple extrusionand reprocessing of scrap.

The mechanical properties of the polycarbonates to which the moldrelease agents of the invention have been added are identical with thoseof the pure polycarbonates. Because of the unusual heat stability andcomplete solubility of the perfluoroalkanesulphonic acid derivatives ofthe invention in the polycarbonate melt, the polycarbonate moldingmaterials to which the mold release agents of the invention have beenadded remain transparent and completely colorless.

By using the mold release agents of the invention, excellent moldrelease of polycarbonate moldings is achieved, a particular advantagebeing that the mold release can take place in a very broad temperaturerange. As a result, the injection molding cycles become independent oftemperature fluctuations in the injection mold, and this is a greatadvantage for the plastics processor.

The surprising feature of the invention is that compared to known moldrelease agents, such as, for example, the fatty acid esters of glycerol,mold release properties which are far superior to those with known moldrelease agents are achieved with far smaller amounts of the mold releaseagents according to the invention.

Aromatic polycarbonates used in the sense of the present invention areunderstood to include homopolycarbonates and copolycarbonates based, forexample, on one or more of the following bisphenols:bis-(hydroxyphenyl)-alkanes and bis-(hydroxyphenyl)-cycloalkanes, aswell as their nuclear-alkylated and nuclear-halogenated compounds.Further aromatic dihydroxy compounds are described, for example, in U.S.Pat. Nos. 3,028,365; 2,999,835; 3,148,172; 3,271,368; 2,991,273;3,271,367; 3,280,078; 3,014,891 and 2,999,846, in GermanOffenlegungsschriften (German Published Specifications) Nos. 1,570,703;2,063,050; 2,063,052; 2,211,956 and 2,211,957, in French Pat. No.1,561,518 and in the monograph "H. Schnell, Chemistry and Physics ofPolycarbonates, Interscience Publishers, New York, 1964".

Examples of preferred bisphenols are: 2,2-bis-(4-hydroxyphenyl-propane,2,4-bis-(4-hydroxylphenyl)-2-methylbutane,1,1-bis-(hydroxyphenyl)-cyclohexane,2,2-bis-(3-methyl-4-hydroxyphenyl)-propane,2,2-bis-(3-chloro-4-hydroxyphenyl)-propane,bis-(3,5-dimethyl-4-hydroxyphenyl)-methane,2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane,2,4-bis-(3,5-dimethyl-4-hydroxyphenyl)-2-methylbutane,1,1-bis-(3,5-dimethyl-4-hydroxyphenyl)-cyclohexane,2,2-bis-(3,5-dichloro-4-hydroxyphenyl)-propane and2,2-bis-(3,5-dibromo-4-hydroxyphenyl)-propane.

Examples of particularly preferred bisphenols are:2,2-bis-(4-hydroxyphenyl)-propane,2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane,2,2-bis-(3,5-dichloro-4-hydroxyphenl)-propane,2,2-bis-(3,5-dibromo-4-hydroxyphenyl)-propane and1,1-bis-(4-hydroxyphenyl)-cyclohexane.

Preferred aromatic polycarbonates are those based on one or more of thebisphenols stated to be preferred. Particularly preferred polycarbonatesare based on 2,2-bis-(4-hydroxyphenyl)-propane and optionally one of theother bis-phenols stated to be particularly preferred.

The aromatic polycarbonates can be manufactured according to knownprocesses, e.g., in accordance with the melt transesterification processfrom bisphenols and diphenyl carbonate, and in accordance with thetwo-phase boundary process from bisphenols and phosgene, as described inthe above-mentioned literature.

The aromatic polycarbonates can also be branched as a result of theincorporation of small amounts of polyhydroxy compounds having more thantwo aromatic hydroxy groups, e.g. 0.05-2.0 mol-% relative to thebisphenols employed. Polycarbonates of this nature are described, forexample, in German Offenlegungsschriften (German PublishedSpecifications) Nos. 1,570,533; 1,595,762; 2,116,974 and 2,113,347,British Pat. No. 1,079,821 and U.S. Pat. No. 3,544,514. Some examples ofthe polyhydroxy compounds which can be used are phloroglucinol,4,6-dimethyl-2,4,6-tri-(4-hydroxyphenyl)-heptene-2,4,6-dimethyl-2,4,6-tri-(4-hydroxyphenyl)-heptane;1,3,5-tri-(4-hydroxyphenyl)-benzene, 1,1,1-tri-(4-hydroxyphenyl)-ethane,tri-(4-hydroxyphenyl)-phenylmethane,2,2-bis-[4,4-(4,4'-dihydroxydiphenyl)-cyclohexyl]-propane,2,4-bis(4-hydroxyphenyl-isopropyl)-phenol,2,6-bis-(2'-hydroxy-5'-methylbenzyl)-4-methylphenol,2-(4-hydroxyphenyl)-2-(2,4-dihydroxyphenyl)-propane and1,4-bis-(4',4"-dihydroxy-triphenyl-methyl)-benzene.

The aromatic polycarbonates should as a rule have molecular weightsM_(w) of about 10 000 to more than 200 000, preferably of about 20 000to 80 000.

Perfluoroalkanesulphonic acid derivatives in the sense of the presentinvention are in particular those of the formula

    R.sub.F - SO.sub.2 -X (IIa + IIc)

as explained above.

The amides of the formula IIa can be obtained analogously according toknown processes, in the absence of water, by reaction of theperfluoroalkanesulphonic acid halides with secondary or primary aminesor ammonia: see Gmelin Handbuch (Gmelin's Handbok), supplement to 8thedition, volume 12, part 2, pages 158 et seq.

Examples of compounds of type IIa are:N-cyclohexyl-perfluorooctanesulphonamide,N-methyl-perfluorooctanesulphonamide,N-methyl-perfluorodecanesulphonamide,N-butyl-perfluorooctanesulphonamide,N,N-dimethyl-perfluorooctanesulphonamide,N-benzyl-perfluorodecanesulphonamide,N-stearyl-perfluorooctanesulphonamide,N-stearyl-N-methyl-perfluorooctanesulphonamide andperfluorooctanesulphonamide.

The cyclimmonium salts of the formula IIc are obtainable in accordancewith the reaction, described by V. Beyl, H Niederprum and P. Voss inLiebigs Ann. Chem. 731 58-66 (1970), of perfluoroalkanesulphonylfluoride with silane in the presence of the corresponding heterocyclicnitrogen compounds.

Examples of compounds of type IIc are: N-methyl-pyridiniumperfluorobutanesulphonate, N-methyl-pyridinium perfluorooctanesulphonateand N-methyl-quinolinium perfluorooctanesulphonate.

The use, according to the invention, of the perfluoroalkanesulphonicacid derivatives of the formula IIc as mold release agents forpolycarbonates was surprising inasmuch as it was to be expected at thepolycarbonate processing temperature of about 280° C and above, thatquaternized nitrogen compounds of this type would decompose thermally,as described by A. W. v. Hofmann, with ring scission (compare H. Beyer,Lehrbuch der org. Chem., (Textbook of Organic Chemistry), 1963, page632). The use, according to the invention, of theperfluoroalkanesulphonic acid derivatives of the formula IIa as moldrelease agents for polycarbonates was surprising inasmuch as it was tobe expected at the polycarbonate processing temperature of about 280° Cand above, that the amides of the formula IIa which generally are liquidat a temperature of about 20° C, are distilling off the polycarbonatemelt. This doesn't happen.

The mold release agents according to the invention are incorporated, forexample, by applying the substances, onto the granules of thepolycarbonate by tumbling respectively by spraying, and subsequentlyextruding the material on a twin-screw extruder at about 280° C to froma ribbon, which is granulated.

However, the mold release agent can also be incorporated into thepolycarbonate during the manufacture of the polycarbonate. In that casethe perfluoro compound is either admixed, as a solution in a solvent,before reaching the devolatilization screw, or is metered, withoutsolvent, into the polycarbonate melt.

In view of the small amounts of mold release agents to be used accordingto the invention it is advantageous, for uniform metering andincorporation, first to prepare a concentrate of the perfluoro compoundsto be used according to the invention in polycarbonate, according tocustomary methods, and to meter this concentrate into the polycarbonatemelt.

The use according to the invention of the mold release agents has noadverse effect either on the transparency or on the color of thepolycarbonates.

Optionally, dyestuffs, pigments, stabilizers, flame-proofing agents,fillers and glass fibers and other materials can also be added to thepolycarbonate without thereby impairing the effectiveness of the moldrelease agent.

Suitable glass fibers in this context are all grades and types of glassfiber which are commercially available, i.e., cut glass fibers (longglass fibers and short glass fibers) and rovings or staple fibers,provided that they have been finished with suitable sizes to make themcompatible with polycarbonate.

The length of the glass filaments, whether bundled to form fibers ornot, should be between 60 mm and 6 mm in the case of long glass fibers,whereas in the case of short glass fibers the maximum length should bebetween 5 mm (5000μm) and 0.05 mm (50 μm).

Two types of glass fiber are particularly preferred:

I. Long glass fibers having an average fiber length of 6,000μm, adiameter φ of 10 μm and a powder content (-50 μm) of about 1% by weight,and

II. Ground short glass fibers having an average fiber length of 230 μm,a diameter φ of 10 μm and a powder content (<50 μm) of about 5% byweight.

Usable glass materials are alkali-free aluminum-boron-silicate glass("E-glass") and also alkali-containing "C-glass".

Suitable sizes which can be used are those known from the literature;the known aqueous size for short glass fibers (compare DT-AS (GermanPublished Specification) No. 1,201,991) has proved particularly suitablefor polycarbonate compositions.

Further details regarding glass fibers and their use in plastics,especially in polycarbonates, are known from Harro Hagen,Glasfaserverstarkte Kunststoffe (Glass fiber-reinforced plastics),Springer-Verlag, Berlin, Gottingen, Heidelberg, 1961 (especially pages182-252) and from U.S. Pat. No. 3,577,378 (Ue 2,159-Cip).

In the present context, the glass fibers can be used in the customaryamounts, preferably in amounts of 1% by weight to 30% by weight,relative to the total weight of glass fibers + polycarbonate.

The thermoplastic polycarbonate molding materials which have beenmodified with the mold release agents according to the invention so asto have good mold release properties are employed wherever moldings aremanufactured fully automatically, in large numbers and with short cycletimes, by the injection molding process. This applies, for example, tothe use in the electrical industry and the optical field, for examplefor terminal bars, bobbins, housing components such as projectorhousings, floors of switch cabinets and the like, and for particularlycomplicated moldings which are molded in molds in which these are zoneswhich differ greatly in temperature. When manufacturing such articles,no mold release difficulties are found even at elevated temperatures.

The effectiveness of the perfluoroalkanesulphonic acid derivatives ismeasured in terms of the mold release forces required for the moldrelease of injection molding materials. In the examples which follow,these forces are measured by rendering visible, via an optical and atthe same time recording indicator instrument, the pressure which buildsup in the hydraulic cylinder of the ejector system during mold release.

The examples which follow are intended to explain the subject of theinvention in more detail:

EXAMPLES

Preparation of a polycarbonate and preparation of one mold release agentof each of the formula IIa and IIc.

General Instructions for the Preparation of Polycarbonates

Approximately 454 parts of 4,4'-dihydroxydiphenyl-2,2-propane and 9.5parts of p-tert.-butylphenol are suspended in 1.5 liters of water. Theoxygen is removed from the reaction mixture in a 3-necked flask,equipped with a stirrer and gas inlet tube, by passing nitrogen throughthe reaction mixture for 15 minutes, while stirring. 355 parts of 45%strength sodium hydroxide solution and 1,000 parts of methylene chlorideare then added. The mixture is cooled to 25° C. While maintaining thistemperature by cooling, 237 parts of phosgene are added over a period of120 minutes. An additional amount of 75 parts of a 45% strength sodiumhydroxide solution is added after 15-30 minutes or after the absorptionof phosgene has started. 1.6 parts of triethylamine are added to theresulting solution and the mixture is stirred for a further 15 minutes.A highly viscous solution is obtained, the viscosity of which isregulated by adding methylene chloride. The aqueous phase is separatedoff. The organic phase is washed with water until free from salt andalkali. The polycarbonate is isolated from the wash solution and dried.The polycarbonate has a relative viscosity of 1.29-1.30, measured in a0.5% strength solution in methylene chloride at 20° C. This correspondsapproximately to a molecular weight of 32,000. The polycarbonate thusobtained is extruded and granulated.

Preparation of a mold release agent of the formula IIa

N-Methyl-perfluorooctanesulphonamide is obtained in accordance with U.S.Pat. No. 3,636,085 of Ciba-Geigy Corp. (E. K. Kleiner) fromperfluorooctanesulphonyl fluoride and methylamine in ether as thesolvent, at a reaction temperature of -30° to 0° C and with a reactiontime of 2-3 hours. The melting point is 101°-103° C.

Preparation of a mold release agent of the formula IIcN-methyl-pyridinium perfluorobutanesulphonate

151 g (0.5 mol) of perfluorobutanesulphonyl fluoride, 30 g (0.025 mol)of dimethyldimethoxysilane, 39.5 g (0.5 mol) of pyridine and 200 ml ofacetonitrile as the solvent are mixed in a flask, and stirred; thesecond phase originally present disappears over the course of about 10hours. The solvent, and the fluorosilane formed, are then distilled offand the residue is washed with benzene. After drying, the desiredcompound is obtained in a yield of about 85% of theory.

I. The aromatic polycarbonates used

Their viscosities are measured at 25° C in methylene chloride at aconcentration of 5 g/1.

A. An aromatic polycarbonate based on 4,4'-dihydroxy-diphenylpropane-2,2(bisphenol A) and having a relative viscosity of η_(rel). = 1.30, andM_(LS) = 28,000 (M_(LS) = molecular weight determined by lightscattering).

B. An aromatic polycarbonated based on 90 mol% of bisphenol A and 10mol% of 4,4'-dihydroxy-3,3',5,5'-tetrabromodiphenylpropane-2,2(tetrabromobisphenol A), having a relative viscosity of η_(rel). = 1.33,and M_(LS) = 37,000. (M_(LS) = molecular weight determined by lightscattering).

C. An aromatic polycarbonate based on 70 mol% of bisphenol A and 30 mol%of 4,4'-dihydroxy-3,3',5,5'-tetramethyldiphenylpropane-2,2(tetramethylbisphenol A) having a relative viscosity of η_(rel). = 1.28,and M_(LS) = 31,000.

D. An aromatic polycarbonate based on 4,4'-dihydroxydiphenylpropane-2,2(bisphenol A) having a relative viscosity of η_(rel). = 1.32 and M_(LS)= 30,000, with a glass fiber content (sized long glass fibers, averagefiber length, 6 mm, diameter 10μ, powder content < 50μ, approx. 1%) of20% by weight. It is obtained by extruding 80 kg of a polycarbonate ofrelative viscosity η_(rel). = 1.32, and M_(LS) = 30,000 in a twin-screwextruder at 310° C. At the same time, 20 kg of glass fibers (sized longglass fibers, average fiber length 6 mm, diameter 10μ, powder content <50μ, 1% by weight) are added. The polycarbonate which has beenglass-fiber-reinforced in this way is granulated in accordance withcustomary techniques. The properties are described in Tables 1 and 2.

II. The mold release agents used

E. Glycerol triesters with acid radicals of stearic acid, palmitic acidand myristic acid in the ratio of 1:1:0.1, melting point 48° C.(Obtainable in accordance with customary ester syntheses; compare alsoDT-OS (German Published Specification) No. 2,064,095 and U.S. Pat. No.3,784,595).

G. N-Methyl-perfluorooctanesulphonamide C₈ F₁₇ SO₂ NHCH₃, melting point= 101°-103° C.

H. N-methyl-pyridinium perfluorobutanesulphonate, C₄ F₉ SO₃ ⁻ [CH₃N^(+C) ₅ H₅ ], melting point = 83°-85° C.

EXAMPLES 1, 2, 3 and 4 Polycarbonates A, B, C and D without mold releaseagents

The mold release behavior of the polycarbonates A, B, C and D is testedon a conical cylinder of 35 mm length and of 40 and 42 mm diameters, and3 mm wall thickness, by measuring the pressure which builds up in theejector system. The mold release pressures and temperatures areindicated in Table 1. A molding injection-molded from thesepolycarbonates at 270° C has the mechanical properties described inTable 2.

EXAMPLE 5

0.5 kg of mold release agent E is applied to 99.5 kg of polycarbonate Aby tumbling in a drum at room temperature and the material is thenextruded to a ribbon on an extruder at 280° C, and is granulated. Themold release behavior is tested as in Example 1. The properties aredescribed in Tables 1 and 2.

EXAMPLE 6

0.1 kg of mold release agent G is applied to 99.9 kg of polycarbonate Aby tumbling in a drum at room temperature and the material is thenextruded to a ribbon on an extruder at 280° C, and is granulated. Themold release behavior is tested as described in Example 1. Theproperties are described in Table 1 and 2.

EXAMPLE 7

100 kg of polycarbonate D, during the manufacture of which 10 g of amold release agent H are metered in together with the glass fibers. Theproperties of the granules obtained after extrusion are described inTables 1 and 2.

                                      TABLE 1                                     __________________________________________________________________________    Mold Release Behavior of the Polycarbonates from Examples 1 to 9                                     MOLD RELEASE TEMPERATURE ° C                    EXAMPLE                                                                             COMPOSITION      MOLD RELEASE PRESSURE, BARS                            __________________________________________________________________________                           150° C                                                                      160° C                                                                      170° C                                                                          180° C                       1     100% of polycarbonate A                                                                        40   30   85       Does not release                    2     100% of polycarbonate B                                                                        44   36   80       "                                   3     100% of polycarbonate C                                                                        48   35   82       "                                   4     100% of polycarbonate D                                                                        42   65   does not release                                                                       Does not release                    5     99.5% of polycarbonate A                                                       0.5% of mold release agent E                                                                  40   15   37       Sticks firmly                       6     99.9% of polycarbonate A                                                       0.1% of mold release agent G                                                                  12    5    3       80                                  7     Polycarbonate D  18   18   80       Sticks firmly                             0.01 % of mold release agent H                                          __________________________________________________________________________

                                      TABLE 2                                     __________________________________________________________________________    Properties of the polycarbonates from Examples 1 to 9                                    Dimension                                                                           DIN  1   2   3   4   5   6   7                               __________________________________________________________________________    η.sub.rel         1.30                                                                              1.33                                                                              1.28                                                                              1.30                                                                              1.28                                                                              1.29                                                                              1.30                            Elongation at break                                                                      %     53,455                                                                             120 100 125 4.3 110 115 4.3                             Notched impact                                                                strength   KJ/m.sup.2                                                                          53,453                                                                              44  38  14  12  36  43  12                             Vicat B    ° C                                                                          53,460                                                                             150 155 156 153 145 150 153                             Elongation at break                                                           after heating*)  53,455                                                                             115 100 120 3.5 60  110 3.2                             Vicat B after                                                                 heating*)        53,460                                                                             150 154 154 152 135 148 152                             η.sub.rel after heating*)                                                                       1.30                                                                              1.32                                                                              1.29                                                                              1.30                                                                              1.24                                                                              1.29                                                                              1.30                            __________________________________________________________________________     *)The polycarbonate test specimens were heated for 300 hours at               130° C                                                            

Although the invention has been described in detail in the foregoing forthe purpose of illustration, it is to be understood that such detail issolely for that purpose and that variations can be made therein by thoseskilled in the art without departing from the spirit and scope of theinvention except as it may be limited by the claims.

What is claimed is:
 1. A molding composition comprising an aromaticpolycarbonate and from about 0.001 to 1% by weight of a mold releaseagent selected from the group consisting of perfluoro-alkanesulphonicacid amides and cyclimmonium salts of perfluoro-alkanesulphonic acids.2. The molding composition of claim 1 wherein the aromatic polycarbonatehas a molecular weight from about 10,000 to 200,000.
 3. The moldingcomposition of claim 1 wherein the aromatic polycarbonate contains fromabout 0.001 to 0.01% by weight of the mold release agent.
 4. The moldingcomposition of claim 1 wherein the mold release agent consists ofperfluoroalkanesulphonic acid amides of the general formula IIa:

    R.sub.F - SO.sub.2 - X                                     IIa

wherein R_(f) is a linear or branched aliphatic perfluoroalkyl radicalwith 1 to 12 C atoms or a cyclic aliphatic perfluoroalkyl radical with3-12 C atoms and X is NR¹ R²,wherein R¹ and R² are identical ordifferent and can be hydrogen, C₁ -C₁₈ alkyl, C₇ -C₂₀ aralkyl and C₅-C₂₀ cycloalkyl, and furthermore R¹ and R² can form a heterocyclicstructure with the N atom.
 5. The molding composition of claim 1 whereinthe mold release agent consists of cyclimmonium salts ofperfluoroalkanesulphonic acids of the general formula IIc:

    R.sub.F - SO.sub.2 - X                                     IIc

wherein R_(f) is a linear or branched aliphatic perfluoroalkyl radicalwith 1 to 12 C atoms or a cyclic aliphatic perfluoroalkyl radical with3-12 C atoms and X is ##STR5## wherein R¹ can be C₁ -C₁₈ alkyl, C₇ -C₂₀aralkyl or C₅ -C₂₀ cycloalkyl and ##STR6## is an aromatic heterocycliccompound containing 1 hetero nitrogen atom.
 6. The molding compositionof claim 1 wherein said aromatic polycarbonate is derived from anaromatic dihydroxydiaryl compound of the general formula: ##STR7##wherein R are identical or different and are H, C₁ -C₄ alkyl, Cl or BrandX¹ is C₁ -C₈ alkylene, C₂ -C₈ alkylidene, C₅ -C₁₅ cycloalkylene andC₅ -C₁₅ cycloalkylidene.
 7. The molding composition of claim 6 whereinsaid aromatic dihydroxydiaryl compound is selected from the groupconsisting of 2,2-bis-(4-hydroxyphenyl)-propane,2,2-bis-(3,5-dimethyl-4-hyroxyphenyl)-propane,2,2-bis-(3,5-dichloro-4-hyroxyphenyl)-propane,2,2-bis-(3,5-dibromo-4-hydroxyphenyl)-propane and1,1-bis-(4-hydroxyphenyl)-cyclohexane.
 8. The molding composition ofclaim 1 wherein a glass fiber is added to the aromatic polycarbonate andthe mold relese agent.